Pipe-working machine



June 18, 1929. H, D, PENNlNGTCN 1,718,068

PIPE WORKING MACHINE Filed June 1925 6 Sheets-Sheet l June 18, 1929.PENNlNGTON 1,718,068

PIPE WORKING MACHINE File d June 9, 1925 6 Sheets-Sheet 2 INVENTOR June18, 1929. H. D. PENNINGTON PIPE WORKING MACHINE Filed June 9, 1923 6Sheets-Sheet June 18, 1929. H. D. PENNINGTON PIPE WORKING MACHINE k mi0% as 0M hm a M I T I hm M WW ms m W mw -:E. Kw 1'. H. H. 1 i L W fl k.51 -m m m $3 WM. m6 WHW Mm R W4 mm 2 mm D mk mm mmT QB Q June 18, 1929.H. D. PENNINGTON 1,718,068

PIPE WORKINGMAGHINE Filed June 9, 1923 6 Sheets-Sheef 6 INVENTORPatented June 18, 1929.

UNITED STATES PATENT OFFICE.

HARLEY D. PENNINGTON, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO UNITEDENGINEERING & FOUNDRY COMPANY, OF PITTSBURGH, PENNSYLVANIA, A COR-PORATION or PENNSYLVANIA.

PIPE-WORKING MACHINE.

Application filed Juliet), 1923.

This invention relates to pipe-working machines, and is particularlydirected toward a pipe-rounding mechanism which is conveniently used inconnection with a pipe-threading machine. I provide means for rotatingthe pipe and a rounding die which engages the pipe as it is rotated. Thedie is made in a plurality of parts and the parts are simultaneouslymovable toward the pipe. This prevents the pipe from striking one of therounding dies during operation, and also gives a superior roundmgaction.The rounding dies are mounted on a carriage which may be moved back andforth as the pipe is rotated, thus working the metal in the pipe andimparting true roundness.

In the accompanying drawings, there is shown, for purposes ofillustration only, one embodiment of the present invention, it be ingunderstood that the drawings do not deline the limits of the invention,as changes may be made in the'construction and operation thereindisclosed without departing from the spirit of the invention or scope ofmy broader claims.

In the drawings: V

Figurel is a top plan view of a threading machine embodying myinvention;

Figure 2 is a side elevation of the machine;

Figure 3 is a transverse vertical sectional view taken on the line TIIlTI of Figure 1;

Figure 4- is a view partly in elevation and partly in section, thesection being taken on the line IVIV of Figure 1;

Figure 5 is a horizontal view of a portion of the apparatus illustratinga drive mechan un for shifting the pipe rounding carriage;

Figure 6 is a side elevation of the split nut, for engagement with thelead-screw, and parts associated therewith;

Figure 7 is a sectional view on theline VII-VII of Figure 6; I

Figure 8 is a detail view showing the two halves of the split nut insection;

Figure 9 is a detail sectional view of the spring-actuated detent forthe split nut operating means;

Figure 10 is a view partly in section and partly in elevation of therounding mechanismvand operating parts associated therewith; v

Figure 11 is a sectional view on the line XI+XI of Figure 10. I

Serial No. 644,314.

Referring to the drawings, the machine may comprise, as usual, a bed A,at one end of which is mounted a housing Bin which 1s contained themeans for gripping and retating the pipe and for actuating theleadscrew, including the change speed mechanism. Upon the bed A is alsomounted a reciprocable carriage C which carries the threading die,rounding die, cutting-off knife, and other associated parts.

Referring particularly to Figures 1 to 4 inclusive, a barrel 2 forreceiving the pipe is suitably journaled for rotation in the lions ingB. Mounted upon the forward end of the barrel 2 is a chuck 3, forgripping the pipe so it may be rotated.

Mounted upon the top of the housing B is the main driving motor 23 forrotating the barrel 2 and actuating a lead-screw to be hereinafterdescribed. The shaft of the n10- tor 23 carries a pinion 24 meshing witha gear 25, the latter driving a gear 26 mounted upon one end of a shaft27 journaled in the housing B and carrying a pinion 28 meshing with agear 29 on a second shaft 30 parallel to the shaft 27 and carrying apinion 31,

in d -iving engagement with a large gear 32 carried by thebarrel 2.

The gear 32 drives a gear 33 mounted upon a shaft 34, the latterhavingmounted upon one end thereof a bevel gear 35 meshing with a similarbevel gear 86 on the end ofa shaft 37. engages a worm wheel 39 on ashaft 40. The shaft 40 carries a pair of spaced gears of clifferentsizes and constituting elements of a change-speed mechanism foractuating the hereinbefore referred to lead-screw. This cliange-spcedmechanism may also comprise gears of different sizes and mounted on ashaft 46 carried by spaced rocker-arms 47. These rocker-arms arejournaled upon 7 a shaft 49. This change speed gearing is effective for'driving'the shaft 49 at desired speed. The arm 47 is provided with anintegral extension which extends through an opening in the front of thehousing B and is provided with a barrel portion 61 in which is mounted aspring-pressed pin 62 adapted to engage any one of a plurality of holes63 in the housing B to hold the change-speed mechanism in the desiredadjusted position.

The shaft 49 is in alignment with a leadscrew 64-, and is operativelyconnected to the The shaft 37 carries a worm 38-which latter by asuitable coupling 65. The leadscrew 64 is adapted to be operativelyconnected to the carriage C by a clutch which is illustrated in detailin Figures 6 to 9 inclusive. This clutch comprises a split-nut 66, thetwo halves of which are shown in section in Figure 8 and which aremounted for sliding movement towards and from each other in a suitablesupporting housing 67 integral with and projecting from the front of thecarriage C. This supporting housing 67 may be provided with a suitablecover plate 68 secured thereto by screws 69. Each half of the nut 66 hasan opening 70 extending therethrough for receiving a pin 71. The pins 71extend at their opposite ends through cam slots 72 in a pair of camplates 73 arranged at opposite ends of the housing 67. Each of these camplates is provided with a central opening for receiving the lead-screw6 1. The cam plates 73 are maintained upon the pins 71 by means ofwashers 741 and cotter pins 75 carried by the respective ends of saidpins 71.

Journaled in brackets 76 carried by the bed A is a shaft 77 which isrectangular in cross-section. Slidably mounted upon the shaft 77 is abushing 78 the latter being journaled in the housing 67 and projectingat opposite ends therefrom. Mounted upon each projecting end of thebushing 78 and secured thereto by a set screw 79 is a rockerarm 80 oneof said rocker-arms being provided with an integral handle portion 81.Each rocker-arm 80 is curved to extend around the front and over the topof the leadscrew 64: and is pivotally connected at its upper end to theadjacent cam plate 73 by means of a pin 82 fixed in the cam plate andhaving a threaded end portion to extend through an opening in the lever80. Mounted upon the threaded end portion is a nut 83. One of the camplates 73 is provided in its peripheral edge with three spaced recessesor depressions 84., 85 and 86 adapted to be engaged by a spring actuatedball detent 87 mounted in the housing 67. It will be noted by referenceparticularly to Figure 7 that each slot 72 in the cam plates 7 8comprises a portion which is concentric with the axis of the lead scre Yand another portion which is eccentric thereto. 7

The operation of the clutch above described is as follows: In Figure 7the ball detent 87 is shown in engagement with the recess 81. In thisposition of the parts, the halves of the slit-nut 66 are moved out ofengagement with the lead-screw 6 1 because the pins 71 are located inthe concentric portions of the slots 72. Rotation of the lead-screwwill, therefore, have no effect upon the carriage C. Tf the handle 81 isactuated to rotate the cam plates 73 in a counter clockwise direction(Figure 7 until the ball detent 87 engages the intermediate recess 85,this being the neutral position of the parts, the halves of thesplit-nut will remain in the open position because this movement of thecam plates does not carry the pins 71 out of the concentric portions ofthe slots 72. However, when the handle 81 is further actuated to rotatethe cam plates 7 3 into a position in which the ball detent 87 dropsinto the recess 86 the split-nut 66 is closed upon the lead-screw 6 1',the latter is operatively connect-ed to the carriage C and rotation ofthe lead-screw will cause movement of said carriage towards or from thehousing B, depending upon the direction in which the lead-screw isrotated.

The bed A is provided with suitable parallel tracks 88 and the carriageCinay be supported for reciprocation on the bed by means of rollers 89which engage said tracks and are journaled by means of roller bearings89 upon fixed pins 90'carricd by the carriage pr the carriage maydirectly engage said LltlCkS or the bed.

The carriage C is provided at each side thereof with a downwardly facingrack adjacent the corresponding track 88. J ournaled in the bed A andextending transversely thereof is a hollow shaft 96 having mountedthereon a pair of pinions 97 engaging the racks 95. V

For moving the carriage C on the bed A independently of the main motor23, an additional motor 98 is provided. Referring to Figure 1, the shaftof the motor 98 is provided with a worm 99 in driving engagement with aworm wheel 100 on a shaft 101'. The shaft 101 carries a bevel pinion 102engaging a bevel gear 103 journaled loosely upon the hollow shaft 96.'The bevel gear 103 is integrally formed on one end of a sleeve 104 uponthe other end of which is formed a clutch member 105. A cooperatingclutch member 106 is formed on a collar 107 keyed to the hollow shaft 96for sliding movement thereon.

The collar 107 is operatively connected to the rock shaft 77 by meansshown in detail in Figure 5. This means comprises a lever 108 pivotedintermediate its ends at 109 and pivotally connected at one end to a pin110 carried by a member 111 engaging in a pcripheral groove in saidcollar 1.07. The lever 108 is pivotally connected at its other end to apin 112 carried by a sleeve 118 slidably mounted upon a rod 114-. Therod 114: is pivotally connected at one end to the bifurcated end of arocker-arm 115 carried by the shaft 77. The opposite end of the rod 111- is screw-threaded and has mounted thereon nuts 116 engaged by awasher 117. Mounted loosely upon the rod 114 intermediate the sleeve 113and the washer 117 is a washer 118 surrounding the rod 114 intermediatethe washers 117 and 118 is a coil spring 119.

The rod 114. may assume any one of three positions corresponding to theopen, neutral and closed positions of the split-nut 66. The full lineposition of the rod 114 shown in Figure 5 and represented by thereference character a corresponds to the closed position of the nut 66,in which position of said nut the ball detent- 87 engages the recess 86.W hen the handle 81 is moved to the neutral position in which the detent87 engages in the recess 85, the rod 114 assumes the positionrepresented by the reference character 5 in Figure 5. The movement ofthe rod 11st from position a to position Y) has no effect upon thecollar 107 and clutch member 106 carried thereby since the rod 11 1-slides freely through the sleeve 13. This movement of the rod 114;,however, brings the washer 118 into the dotted line position thereofshown in Figure 5, in which position said washer enthe end of the sleeve113. In this neutral position of the nut 66, the carriage C isdisconnected both from the main motor 23 and from the auxiliary motor 98and the carriage C may be moved on the bed A by manually operated meansto be hereinafter described. When the handle 81 is actuated to open thenut 66, which position of the parts is illustrated in Figure 7 whereinthe detent S7 is shown in engagement with the recess 8 1, the rod 11%assumes the position in dicated b the reference character in Figure 5.The movement of the rod from the position b to the position 0 causes thelever 108 to be swung into the dotted line position thereof indicated inFigure 5, thereby moving the clutch member 106 into engag ment with thecooperating clutch member 105 on the sleeve 104:. By providing thespring 119 and loose Washer 118, it will be tpparent that the clutchmember 106 is yieldn- 'ly actuated into engagement with its cooperatingclutch member 105, thereby enebling said clutch members to interengagevitbout danger of breakage of the teeth of said clutch members eventhough the clutch member 105 he rotating. When the clutch member 106 isbrought into operative engagement with the clutch member 105, the motor98 is operatively connected to a carriage C through the hollow shaft 96,pinions 97, and racks 95, and at the same time the main motor 23 isdisconnected fromthe carriage C by reason of the fact that the nut 60 isat this time in the open position.

AS already stated, when the handle 81 is in the neutral positionthereof, both motors 23 and 98 are disconnected from the carriage C andthe latter may at this time be moved on the bed by manually operatedmeans. This means comprises a rod 120 sliding and rotating in the.hollow shaft 96 and having on one end thereof an operating handle 121.The normal position of the rod 120 and handle 121 is the dotted-lineposition of these parts indicated in Figure 5. The rod 120 carries apinion 122 adapted to engage a gear 123 on a shaft 124. The shaft 124:carries a second gear 125 meshing with. one of the pinions 97 on thehollowshaft 96. The normal position of the pinion 122 is the dotted-lineposition thereof indicated in Figure and corresponding to thedotted-line position of the rod 120 and handle 121. In this position ofthe pinion 122, it is out of engagement with the gear 123. After thehandle 81 has been moved to neutral position, if it is desired to movethe carriage C manually by the means just described, it is onlynecessary to push the handle 121 inwardly to cause the pinion 122 toengage the gear 123, whereupon rotation of the handle 121 will causerotation of the shaft 124; and consequently rotation of the hollow shaft96 by reason of the engagement of the gear 125 with the pinion 97.Rotation of the shaft 96 causes movement of the carriage C on the bed Aby reason of the engagement of the pinions 97 with the racks 95.

The carriage C may be provided with a suitable threading die 126,indicated in dotted outline in Figure 2, and also a suitable cutting-offknife 127, indicated in Figure 4.

ltis customary in this art to provide a threading machine with asuitable rounding mechanism. Such mechanism usually comprises a roundingdie made in two halves; the lower half being fixed and the upper halfbeing movable. An objection to the mounting of the rounding die in thismanner is that the end of the incoming pipe is apt to strike the lowerhalf of the rounding die. A feature of the present invention is theprovision of novel means for actuating the rounding die, where by boththe upper half and the lower half of the die may be actuated into andout of operative position. The rounding mechanism of the presentiiiwention is shown in detail in Figures 1-, and 11. Referring to thesefigures, the lower half 1223 of the rounding die is operativelyconnected to the upper half 129 thereof. Said lower half 128 is carriedby a lower crosshead 130. Vertical bars 131 have their lower endsfastened to the opposite ends of said lower crosshead 130 and theirupper ends fastened to the opposite ends of an upper crosshead 132. Thevertical bars 131 slidably engage the inner edges of the legs of aninverted U-shaped supporting standard 133. Cheek-plates 134: arefastened to opposite sides of the crossheads 130 and 132 at the endsthereof and engage the opposite side edges of the legs of said standard133, whereby to guide the vertical reciprocating movements of saidvertical bars 131 and connecting crossheads 130 and 132. The upper half129 of the rounding die is fastened in-the channel of a slidingcrosshead. 135. This crosshead at its opposite ends engages the op-'posite edges of the vertical bars 131, whereby the reciprocatingmovements of said crosshead are guided. Intermediate the top crosshead132 and the sliding crosshead 135 is ar ranged another sliding crosshead136. EX- tending transversely through the central portion of thecrosshead 136 is a nut 137 which is fixed in said crosshead and providedat its opposite ends with trunnions 138. The nut 13'? is provided with avertical screw-threaded bore in engagement with the screw-threaded lowerend of a vertical shaft 139. The shaft 139 is provided with an integralbearing 1&0 whereby said shaft is journaled in the upper crosshead 132but fixed against longitudii'ial movement therein. Above the hearing 110 the shaft provided with a screwtl'ireaded portion 141 engaged by anut 1 12 having an operating handle 1 13. The shaft 139 at its upper endextends through and is keyed to a bushing 1 1 1 journaled. in the upperportion of the standard 133, whereby said shaft may be movedlongitudinally in said bushing 14%. The bushing 14 1 has integral withits upper end a bevel gear 145 which is engaged by a bevel pinion 1%carried by a horizontal shaft 1 1'? journaled in bearings 143 carried bysaid standard 133, said shaft 1 1'? being provided with a suitableoperating handle M9. The sliding crossheads 135 and 136 are operativelyconnected by two pairs of toggle levers 150, each pair of toggle leversbeing pivoted at one end upon a trunnion 151 carried by the crosshead135 and upon a trunnion 138 of the nut 137. The two members of each pairof toggle levers 150 are pivotally connected by a pivot pin 152. A link153 is pivotally mounted at one end upon each pivot pin 152, each ofsaid links being pivoted at its opposite end to an arm of a bell-cranklever 154:. The bell-crank levers 1541- are pivoted at the angle thereofupon a pivot pin 155 carried by the standard 133. The other arms rod158, the piston 159 of which 01 crates in a fluid-pressure cylinder 160.

The operation of the rounding mechanism above described is as follows:The normal in operative open position of the two halves 128 and 129 ofthe rounding die is shown in full lines in Figures 4; and 10. Theposition of a pipe inserted between said parts of the rounding die isindicated in dash and dot lines in these figures. It will be seen thatthe lower half 128 of the die, as well as the upper half thereof, is outof the path of the incoming pipe so that the latter will not strikeagainst said part. When it is desired to engage the pipe by the parts ofthe rounding die either for the purpose of performing the roundingoperation or for the purpose of cutting off the end of the pipe, fluidpressure will be admitted to the cylinder 160 to actuate the togglelevers 150 to straighten the latter.

This operation will cause the upper crosshead 132 to be moved upwardlyuntil the nut 142 on the screw-threaded portion 141 of the shaft 139engages the underside of the'upper portion of the standard 133 and willalso cause the sliding crosshead 135 to move downwardly. As soon as thenut 14:2 engages the underside of the top portion of the standard 133,further upward movement of the upper crosshead 132, and consequently ofthe lower half 128 of the rounding die is arrested, so that furtherstraightening of the toggle levers 150 will result in movement only ofthe upper half 129 of the rounding die. The nut 1 12 may be adjustedupon the screw-threaded portion 141 in order to vary the extent ofupward movement of the crosshead 132. The hand-wheel 149 affords meansfor adjusting the position of the crosshead 136 whereby the path oftravel of the upper half 129 of the rounding die may be shifted. Thishand- Wheel 1 19 also affords means for manual adjustment of thepressure of the rounding die upon the pipe after the toggle levers 150have been straightened by the fluid pressure actuating means. hen it isdesired to round a portion of the pipe, the fluid-pressure actuatingmeans for operating the rounding die may be operated to produce thedesired clamping pressure of said rounding die upon the pipe, whereuponthe handle 81 may be actuated to throw in the clutch for the motor 98.The latter motor may be now actuated to reciprocate the carriage C backand forth upon its bed A to produce the desired rounding.

After the pipe has been cut off and rounded, the rounding die may beopened and the carriage moved by means of the motor 98 to theapproximate position thereof to begin the threading operation whereuponthe lever 81 may be moved through its neutral position to disconnect themotor 98 from the carriage and then into a position to close the nut 66upon the lead screw. After this has been done, the operation of thecarriage C will be under the control of the main motor 23. It will beseen, therefore, that the motor 98 may be utilized to move the heavycarriage C during the rounding operation and to properly position thecarriage preliminary to the cutting-off operation, the roundingoperation or the threading operation. Furthermore, it has already beenpointed out that the carriage may be manually moved by means of thehandle 121 and shaft 120.

I claim:

1. In a pipe-working mechanism, means for rotating a pipe a rounding diehaving a plurality of parts, means for moving said parts inwardly towardeach other to engage the rotating pipe and outwardly away from eachother, and adjustable means for limiting the inward movement of one ofsaid parts, substantially as described.

2. In a pipe-working mechanism, means for rotating a pipe a two-partrounding die, means for moving said parts inwardly toward each other toengage the rotating pipe and outwardly away from each other; andadjustable means for limiting the inward movement of one of said part-s,substantially as described.

3. In a pipe-working mechanism, means for rotating a pipe a two-partrounding die, means for moving said parts inwardly toward each other toengage the rotating pipe and outwardly away from each other, means foradjusting the position of the path of travel of one of said parts, andadjustable means for limiting the inward movement of the other of saidparts, substantially as de scribed.

4. In a pipe-working mechanism, a frame having a window therein, acrosshead slidable in said window, a two part rounding die having one ofits parts connected to said crossh-ead to be moved thereby, a secondcrosshead slidable in said window, a screw jour-,

naled in the first crosshead and havingsecond crosshead to the otherpart of the rounding die, means for operating said toggle means, and anadjustable stop carried by said screw and engageable with said frame forlimiting the inward movement of the, first die part when the toggle isoperated, the path of the second die part being adjustable by means of,said screw, substantially as described.

5. In a pipe working mechanism, a roundin die having a plurality ofparts movable inwardly toward each other and outwardly away from eachother, fluid actuated means for moving said parts and means for rotatinga pipe engaged by the die.

In testimony whereof I have hereunto set my hand. v

HARLEY D. PENNINGTON.

